Measurement of $\ddot{I}{‡}_{cJ}$ decaying into $p\bar{n}\ddot{I}{€}^{-}$ and $p\bar{n}\ddot{I}{€}^{-}\ddot{I}{€}^0$

Abstract

Using a data sample of $1.06\times 10^8$ $\psip$ events collected with the BESIII detector in 2009, the branching fractions of $\ddot{I}{‡}_{cJ}\to p\bar{n}\ddot{I}{€}^{-}$ and $\ddot{I}{‡}_{cJ}\to p\bar{n}\ddot{I}{€}^{-}\ddot{I}{€}^0$ ($J$=0,1,2) are measured{Throughout the text, inclusion of charge conjugate modes is implied if not stated otherwise.}. The results for $\ddot{I}{‡}_{c0}\to p\bar{n}\ddot{I}{€}^{-}$ and $\ddot{I}{‡}_{c2}\to p\bar{n}\ddot{I}{€}^{-}$ are consistent with, but much more precise than those of previous measurements. The decays of $\ddot{I}{‡}_{c1}\to p\bar{n}\ddot{I}{€}^{-}$ and $\ddot{I}{‡}_{cJ}\to p\bar{n}\ddot{I}{€}^{-}\ddot{I}{€}^0$ are observed for the first time.